here in washington over the last couple of days now. you know, you've seen the obama administration, you've seen the pentagon take a very public stance really challenge the north koreans verbally and then the north koreans have ratcheted up. and there's a lot of concern that everybody's just amping up, you know, and it's pretty much going to slip out of control if everybody doesn't take a deep breath and step back. today, the administration, the pentagon, very much doing that making the decision that they will ratchet back on their rhetoric. not necessarily pull back on any of these military moves, but ratchet back the public rhetoric and hope that they can cool down this whole thing. >> all right. barbara, thanks so much. barbara starr there. >>> get more perspective on what is happening in north korea, the abilities as well as intentions in ramping up this aggressive posturing, an expert from columbia university, thanks for joining us. what do you think of the pentagon and change in posture that they're going to be stepping back from the rhetoric. do you think that's a good idea?